[Poppler-bugs] [Bug 14526] New: Poppler incorrectly renders CMYK colors

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=14526

           Summary: Poppler incorrectly renders CMYK colors
           Product: poppler
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: thenders at gmail.com


Created an attachment (id=14361)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14361)
Example of incorrect rendering

It seems that poppler is incorrectly rendering CMYK colors.  Specifically, the
attachment is a picture of a cyan (1,0,0,0) filled color which should convert
to RGB (0,1,1) but is being converted incorrectly to (0,0.67,0.93).

The file GfxState.cc seems to be the culprit.  I changed this file by editing
the function to contain (sorry but I don't know how to write patches)

void GfxDeviceCMYKColorSpace::getRGB(GfxColor *color, GfxRGB *rgb) {
        double c, m, y, k, k1, r, g, b;

        c = colToDbl(color->c[0]);
        m = colToDbl(color->c[1]);
        y = colToDbl(color->c[2]);
        k = colToDbl(color->c[3]);
        k1 = 1 - k;
        r = (1-c)*k1;
        g = (1-m)*k1;
        b = (1-y)*k1;
        rgb->r = clip01(dblToCol(r));
        rgb->g = clip01(dblToCol(g));
        rgb->b = clip01(dblToCol(b));
}

After changing this function to this, everything seems to work as normal.


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